Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed7ccd39468a7662…

MALICIOUS

PDF

85.5 KB Created: 2021-09-15 15:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3bdffe8c0670e867e8cb5fa62cc4f580 SHA-1: a6e7663e977d597ac0137361c280a331d753facf SHA-256: ed7ccd39468a76626795dc3849abdf13ba9fb0bd799f0c445daf86dd9835689a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/uplcv?utm_term=houses+in+bloxburg+one+story PDF link annotation
    • https://ww150003.linebot.net/upfile/files/20210913152257.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/49525917196.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109061142599806.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/12407473904.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/xujatovamaxikigaji.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/fepuxunopipirasurez.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f0fc0434---bavowiloparovut.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44535285628.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/98030748041.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/74074762297.pdfIn PDF document text
    • https://kawanmto.info/contents/files/20054777636.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/tetosizeladigedeluxup.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbff4ad1cc---saxutasowoduwefubibuguxu.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/libifasudes.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/16428399699.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/61684371964.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70862424331.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5fb335c5c---ragumomozizige.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/55112386309.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/dozokesofunonenabuteremi.pdfIn PDF document text
    • https://digireg.ru/upload/xejawisofaros.pdfIn PDF document text
    • https://emmaushuis.org/pages/jasowedavojeni.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/firuro.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/nadujafofezowakija.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/69433662367.pdfIn PDF document text
    • http://aweibel.com/Photo/file/30648235038.pdfIn PDF document text
    • https://lapdonline.org/file/jekupanolexar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE772 18668 bytes
SHA-256: f8c597347f9e2cf91608fc6c707ae0d1f21bef9ac822c65b5f24ebcf4eeefca7
font_01_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 10568 bytes
SHA-256: 9b0a93ddac5cd4d13ea3f7ec841885af257195c59340b4e95c42610ba475af02